lib.rs 1.5 KB
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// Copyright 2018-2019 Parity Technologies (UK) Ltd.
// This file is part of ink!.
//
// ink! is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ink! is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with ink!.  If not, see <http://www.gnu.org/licenses/>.

#![cfg_attr(not(feature = "std"), no_std)]

use ink_core::{
    memory::format,
    storage,
};
use ink_lang::contract;

contract! {
    #![env = ink_core::env::DefaultSrmlTypes]

    /// Holds a simple i32 value that can be incremented and decremented.
    struct Accumulator {
        /// The current value.
        value: storage::Value<i32>,
    }

    impl Deploy for Accumulator {
        /// Initializes the value to the initial value.
        fn deploy(&mut self, init_value: i32) {
            self.value.set(init_value)
        }
    }

    impl Accumulator {
        /// Mutates the internal value.
        pub(external) fn inc(&mut self, by: i32) {
            self.value += by;
        }

        /// Returns the current state.
        pub(external) fn get(&self) -> i32 {
            *self.value
        }
    }
}